A decellularized scaffold derived from squid cranial cartilage for use in cartilage tissue engineering

Cartilage tissue engineering seeks to develop substitutes that mimic native cartilage structure and function. Traditional scaffolds derived from terrestrial animals often struggle to retain structural integrity after decellularization. This limitation motivates exploration of alternative sources. Prior research has shown that dense scaffolds may hinder cell infiltration and nutrient transport. Marine-derived materials offer unique structural properties. Squid cartilage, for instance, has a less compact organization. That uncertainty drove investigation into its potential for decellularization. No prior work had resolved the feasibility of squid cartilage as a scaffold. This gap motivated the current study.

The aim of this research was to assess the suitability of squid cranial cartilage as a decellularized scaffold for cartilage tissue engineering. The specific problem addressed was the structural instability of conventional decellularized scaffolds. The motivation stemmed from the need for a scaffold that preserves microstructure while supporting cell viability. The study sought to determine whether squid-derived scaffolds could maintain extracellular matrix components. It also aimed to evaluate biomechanical and hydrophilic properties. The researchers proposed that squid cartilage’s loose structure could simplify decellularization. The study further aimed to test in vitro and in vivo performance of the scaffold. The goal was to establish a novel cell-free therapeutic option.

The study involved decellularizing squid cranial cartilage using mild conditions. The process preserved extracellular matrix components like proteoglycans and type II collagen. Microscopic analysis assessed surface and internal structure of the scaffold. Biomechanical and hydrophilicity tests evaluated scaffold properties. In vitro experiments tested scaffold extracts for toxicity to chondrocytes. Cell migration and viability were observed in seeded scaffolds. In vivo testing used a rabbit cartilage defect model. Both cell-free and cell-laden scaffolds were implanted to assess regeneration.

The decellularized squid cranial cartilage scaffold (DSCS) retained a smooth surface and interconnected porous structure. It contained high levels of proteoglycans and type II collagen. Biomechanical tests showed favorable strength and flexibility. Hydrophilicity measurements indicated good water interaction. In vitro, scaffold extracts showed no toxicity to chondrocytes. Chondrocytes seeded on DSCS remained viable and spread. In vivo, both cell-free and cell-laden scaffolds promoted cartilage regeneration. The results suggested DSCS is a promising scaffold material.

The study concluded that DSCS is a novel scaffold for cartilage tissue engineering. It preserves extracellular matrix components and supports cell viability. The scaffold’s structure facilitates cell migration and growth. Biomechanical and hydrophilic properties are favorable for tissue engineering. In vivo results showed regeneration potential in a rabbit model. The findings suggest DSCS could serve as a cell-free therapeutic option. The authors propose that squid cartilage’s unique structure simplifies scaffold fabrication. These results support further exploration of marine-derived scaffolds.